What should I check first when NGINX fails?

Question

A failure needs to be narrowed down before settings are changed or operations retried. Which evidence best separates application errors from environment and dependency problems?

Tasadduq Burney · Accepted Answer

Correlate the access-log status with the error log and upstream application logs. A 502 often indicates an upstream connection or response problem; a 504 points toward a timeout. Check DNS, ports, socket permissions and the upstream bind address before changing proxy timeout values.

What should I check first when NGINX fails?

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Your perspective belongs here.

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